Question

A prism produces a deviation



d. what is the deviation produced by three such prisms

Answer 1

As a ray of light enters the transparent material, the ray's direction is deflected, based on the entrance angle (typically measured relative to the perpendicular to the surface), the material's refractive index, and according to Snell's Law. A beam passing through an object like a prism or water drop is deflected twice: once entering, and again when exiting. The sum of these two deflections is called the deviation angle.